Method of making paper bags



Jan. 6, 1953 w. H. BRYCE 2,624,246

METHOD OF MAKING PAPER BAGS Filed Aug. 5, 1949 2 SHEETS-SHEET l i Q Q g ila \1 11 Mam/v 5/? Val Jan. 6, 1953 w. H. Bl RYCE 2,624,246

METHOD OF MAKING PAPER BAGS 2 SHEETS-SHEET 2 Filed Aug. 5, 1949 'IIIIIIIIIIIIIIIIZ r/IIIIIIIIIIIIIIIIIIIA 'IIIIIIIIIIIIIIIIIIII'IIIMIIIIII'IIIIIIIIIIIIIIIIIIII'II VINIVENTOR. W/ZZ/AM a 5/? V0.45,

Afro/m4- r5 Patented Jan. 6, 1953 METHOD OF MAKING PAPER. BAGS William H. Bryce, Memphis, Tenn, assignor to Dixie Wax Paper Company,

Dallas, Tex.

Application August 3, 1949, Serial No. 108,341

2 Claims.

The present invention relates to the method of manufacturing paper bags and the bags produced' thereby which latter are suitable for holding edible commodities, particularly potato chips.

An object of the invention is to produce a reinforced paper bag having high resistance to moisture and moisture vapors and yet have a transparent window through which the edible articles stored therein may be readily visible to the purchaser thereof.

Another equally important object of the invention is to produce bags of the aforesaid character from a stock roll of glassine paper with the aid of conventional coating and bag making machines whereby they may be economically manufactured and render the same commercially desirable.

Other objects of the invention will in part be obvious and in part pointed out hereinafter as the description continues.

Fig. 1 represents a schematic showing in elevation of the path of travel of the webs or sheets of paper from their respective stock rolls through a conventional waxing machine.

Fig. 2 is a detail plan view of the laminated and sealed together sheets of paper after being waxed and prior to its delivery to the bag forming machine.

Fig. 3 is across sectional view of the same.

Fig. 4 illustrates in perspective a bag formed from said laminated sheets of paper and said view being taken from the front face of the bag.

Fig. 5 is a similar perspective view showing the rear face of the bag.

Fig. 6 illustrates schematically a cross sectional view of a relatively wide sheet of glassine paper coated with wax compositions.

Fig. '7 is a similar cross sectional view of the same coated sheet of glassine paper as preformed prior to its delivery to the bag making machine.

Fig. 8 is a detail plan view of the same.

Fig. 9 illustrates in perspective an expanded bag as made upon the bag machine from this single sheet of glassine paper and said view being taken from the rear side of the bag.

Fig. 10 is an enlarged plan view of this paper bag, and

Fig. 11 is a cross sectional View taken on the line ll-ll of Fig. 10.

In preparing sheets of paper to render the same moisture-vapor proof prior to their delivery to a bag forming machine a stock roll H! of glassi'ne paper is mounted upon the waxing machine whereby plied to one or both faces thereof. A pair of spaced stock rolls it of paper arranged at the opposite sides of the roll it each have their webs fed to the waxing rollers whereby one or both sides of each may receive the molten paraffin its web E5 has molten Wax ap- 2 wax. The molten paraffin wax stored in receptaclel a is applied to one face of each of the Webs l5 and Il Whereas the molten paraffin Wax stored in the receptacle I5 is applied to the opposite face of each of said paper webs. After the webs of paper It and H are waxed they are joined together into one composite web 26 where the latter is dried and cooled over the refrigerating rollers 21 prior to being wound into single roll 2-2. It will be noted from Figures 2 and 3 that the web of g-lassine paper 15 is of greater width than that of the webs I! so that after waxing each web, the webs H are drawn over the marginal edges of the web I-5 and forced together whereby the molten wax will cause the webs to' adhere together, as best shown in Fig. 3, as they are continuously drawn through the waxing machine to form the composite single web 221 which latter is wound into the roll 22.

The waxing of the glassine web It greatly increases its transparency and if the webs 11 should be made from glassine papers, they become translucent when sealed to the web [5. However, I preferably use super-calenderised opaque sulphi-te paper in forming the web H as it greatly reinforces the bag structure. The webs i! may be in colors or a combination of colors to render the bags more attractive.

This stoolcroll 22 is thereafter mounted upon a conventional bag forming machine and its composite web first fed through a former whereby the laminated edges thereof are folded over to form the tube of a width equal to that of the bags made therefrom. The marginal overlapping edges of the tube are hot sealed together to form the seam 23'. One end of the tube is then folded over and sealed to form the bottom 24 of a bag and finally the c 'tter of the bag machines shears off the tube into the required length of the bag forming the usual opened or filling end 25 of the bag.

From Fig. 4. it is apparent that the web- I5 forms a window throughout the entire length of each bag and. the webs I'l reinforce the remaining portions of the bag. However, certain portions of the bags window may be reduced by printing upon the strip l5.

To produce bags according to the modified form of the invention as illustrated in Figs. 6 to 11 inclusive of the drawings, only a single stock roll H of glassine paper is employed. The web I of, this stock roll is first waxed by the molten paraffin wax contained in the receptacles l8 and it of the waxing machine and thereafter the coatings 3 and. 4 are applied to the opposedmarginal edges of this single web from the molten wax-wubber-like composition contained in the receptacles 26 and 2! as represented in Fig. 1 of the drawings. After this rubber-like composition is applied, the so-coated webpasses through the drying and cooling stages and is wound upon a stock roll similar to that of the roll 22.

The coatings 2 and 3 of parafiin wax extend only over the medial portion of the web I, as illustrated in Fig. 6, and a pair of spaced rollers feed the rubber-wax-like composition from the receptacle 26 to the surface 4 of the web and an additional pair of spaced rollers apply the coatings 5 to the opposite face of the web I from a receptacle 2'! containing the molten rubber-waxlike composition. All coatings are applied as the web I is drawn continuously through the waxing machine.

The central wax coatings 2 and 3 may contain pure parafiin wax or a composition containing parafiin wax and an artificial resin of courmarone or indene types or mixtures thereof applied to the web I in the manner as described in my former Patent No. 2,118,152 dated May 24, 1938 or the wax composition may be prepared as that set forth in my prior Patent No. 2,271,492 dated January 27, 1942. However, the wax coatings 2 and 3 should not only render that area of the glassine sheet of paper so covered moisture-vapor proof, but should be such as will materially enhance the transparency of the paper sheet so as to provide a window through which articles may be readily viewed therethrough.

The wax composition coatings 4 and 5 preferably contain, in addition to the paraflin wax, a cyclized rubber derivative and a rubbery hydrocarbon material such as is set forth in my Patent No. 2,367,563 dated January 16, 1945. These wax-rubber-like coating compositions somewhat decrease the transparency of the glassine paper web, but still such areas of the glassine paper where so -coated are translucent.

While the web I passes through the waxing machine and after so coating the same, it is dried and cooled so that it can be rewound upon a stock roll and this so-coated roll of paper, similar to the roll 22, can thereafter be delivered to the bag making machine when required.

Prior to delivery of the coated stock roll to the bag machine or by an attachment to the latter, the opposite marginal edges of the web I may be folded over in the manner as is best illustrated in Fig. 7 of the drawings to form the two ply sections 6 of the sheet and. a center transparent section or window I between the same.

As this so-coated and folded sheet of glassine paper passes through a conventional bag making machine, the marginal edges are caused to overlap and then are sealed together along the seam 8 to form the envelope. This envelope has formed therewith the conventional bellowed side walls 9 producing the rear wall I0 and the front wall II. The folded marginal sections 8 of the web I extend completely over the rear wall I 0 and side walls 9 of the bag as is best illustrated in Fig. 11 of the drawings. As these folded sections 6 terminate with the opposite sides of the window section I of the web, only those portions I2 of these folded sections extend along the opposite sides of the front wall II of the bag. One end of the envelope so formed by the bag machine is turned over and sealed to the wall I0 to form the bottom I3 of the bag. As the so formed tube or envelope leaves the bag machine, it is sheared off to the proper length to provide the opened end of the bag with the usual flap I4.

The foldedsections 6 of the web will be heat sealed while passing through the bag machine due to the wax-like thermoplastic coatings 4 and 5 thereupon, thereby preventing the laminated plies of each section 6 from buckling or wrinkling while passing through the bag machine or in the normal use of the so produced bag.

The windows I obviously extend throughout the entire length of the front wall I I of each bag produced, but to provide a more decorative bag and limit the size of the window the glassine sheet may be printed in colors over an area thereof which will limit the size of the window to that indicated by the numeral I5 in Fig. 10 of the drawings. The printing upon the bag is pref erably made upon the glassine sheet prior to coating the same and may extend over portions of both the rear and front walls of the bag, whereby those portions of the glassine paper not having printing thereupon will permit articles within the bag to be viewed from the outside thereof, but better seen from the transparent window I5 than through the translucent or nonprinted sections of the rear wall I0 of the bag.

The bag so manufactured will not only have moisture-vapor-proo-f qualities, but will be reinforced by the multi-ply walls thereof and yet have a window in the front wall thereof whereby one may readily see the contents thereof.

I claim:

1. The method of manufacturing paper bags from a single sheet which consists in wax coating the medial section of said sheet to render the same highly transparent, coating the remaining sections of said sheet with a rubbery-wax composition, to reinforce the same, folding over upon themselves each of said sections of the sheet coated with a rubbery-wax composition into laminated layers, forming said coated and folded sheet into bags whereby said laminated sections of the sheet will extend entirely about the side and end Walls thereof and said highly transparent medial sections of said sheet will form a Window for each bag so formed.

2. The method of manufacturing paper bags from a stock roll of glassine paper which consists in wax coating the opposed faces along the media] section of the web of said stock roll of glassine paper to increase the transparency thereof, coating the opposed faces of the remaining sections of said web with a rubbery Wax-like composition to render the same moisture-vaporproof, folding over upon themselves the sections of the web so coated with a rubbery-wax-like composition to form multi-ply sections and form ing said folded web into bags whereby said multiply sections will provide the rear and side walls of each bag so formed and said medial section of the web with increased transparency will form the front wall of each bag so formed.

WILLIAM H. BRYCE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,865,037 Novick June 28, 1932. 1,868,069 Munson July 19, 1932 2,108,805 Finzel et al Feb. 22, 1938 2,118,152 Bryce May 24, 1938 2,260,064 Stokes Oct. 21, 1941 2,337,348 Prindle Dec. 21, 1943 2,409,314 Rambold Oct. 15, 1946 2,476,325 Rowe July 19, 1949 

1. THE METHOD OF MANUFACTURING PAPER BAGS FROM A SINGLE SHEET WHICH CONSISTS IN WAX COATING THE MEDIAL SECTION OF SAID SHEET TO RENDER THE SAME HIGHLY TRANSPARENT, COATING THE REMAINING SECTION OF SAID SHEET WITH A RUBBERY-WAX COMPOSITION, TO REINFORCE THE SAME, FOLDING OVER UPON THEMSELVES EACH OF SAID SECTIONS OF THE SHEET COATED WITH A RUBBERY-WAX COMPOSITION INTO LAMINATED LAYERS, FORMING SAID COATED AND FOLDED SHEET INTO BAGS WHEREBY SAID LAMINATED SECTIONS OF THE 